Automatic chuck for boring and turning mills.



L. H. VOLDL AUTOMATIC CHUCK FOR BORING AND TURNING MILLS.

APPLICATION FILED JULY 19,1910.

Patented Jan. 17, 1911..

2 SHEETS-SHEBT 1.

IM/E IV 719E? ATTORNEY-5 WITNESSES.-

L. H. VOLD.

AUTOMATIC CHUGK FOR BORING AND TURNING MILLS.

APPLIOATION FILED JULY 19,1910

Patented J an. 17, 1911.

2 SHEETS-SHEET 2.

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INVENTOR FIG. 4. 2: 7W

644M My ATTORNEYS 'UNITED' STATES PATENT OFFICE.

LABS H. VOLD, 0F WESTVILLE, NEW JERSEY, ASSIGNOB T0 WILLIAM SELLERS &GOM- PANY, INCORPORATED, OF PENNSYLVANIA.

PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF AUTOMATIC CHUCK FOR BORING-AND TURNING MILLS.

Specification of Letters Patent.

Patented Jan. 17, 1911.

' Application filed July 19, 1910. Serial No. 572,689.

To all whom it may concern:

Be it known that I, LARS H. VoLD, a citizen of the United States,residing at Vestville. county of Gloucester, and State of New Jersey,have. invented a new and useful Improvement in Automatic Chucks forBoring and 'lurning Mills, of which the following is a full, clear, andexact description, reference being bad to the accompanying drawings,which form a part of this specification.

My invention relates to driving and chucking machinery for boring-mills,which may have to perform the same operation successively on a number ofsimilar pieces. For this purpose, a centering-chuck driven by power isused. A good example of this form of chuck may be described to consistof three radial arms fitted to slots in the table and operated by acentral cam plate, which enga es with the arms, causing them to moveradially. These arms are usually provided with adjustable jaws, whichcan be set for work of various diameters, such as car-wheels or tires.This centering chuck was originally opened and closed by hand; but latermeans were provided to close the chuck automatically, in the action ofstarting, by the power required for boring or turning, and to open thechuck by the sudden arrest of the driving mechanism, this action beingproduced by the friction and inertia of the arts.

1 scribed and claimed in the patent to Lewis,

No. 454,801, of, June 23, 1891, in which the driving mechanism turns acam-plate which moves the arms carrying the chuck jaws into engagementwith the work until the resistance to further tightening becomes sogreat that the table isstarted by the camplate actin against the arms,and in which, when a bra e is applied to the driving mechanism, thuschecking the movement of the cam-plate, the table, continuing to rotateby narily operative and satisfactory, but units own inertia, retractsthe arms to release the chuck jaws from the work. This automaticallyoperating form of chuck is ordider certain conditions the elements offriction and inertia are not always reliable.

For example, the force of the cut may be suflicient to lock the chuck sotightly that the inertia of the table in stopping will not be sufiicientto overcome the frict onpespe- This invention is decially if the natureof the material is such that a slow cutting speed is requisite.

The object of the invention is to provide, in connection with the meansfor tightening the chuck automatically as described, a cont'rivanceadapted to operate, when the driving mechanism is reversed, to hold thetable from movement, thereby efiecting the opening of the chuck, whichcontrivance is rendered inoperative, as soon asthe chuck is the drivingmechanism.

. Another object of the invention is to per-. mit the table-lockingcontrivance to be moved by hand into position to operate and then to beapplied and released as described without further operation of thehand-control.

Another object of the invention is to provide for the describedhand-operation of the table-locking contrivance by means of the samecontroller by which the reversal of the driving mechanism is eflectedfThe mechanism for effecting the foregoing object is illustrated in theaccompanyin drawings, in. which l igurc 1 is a plan view of a boringmill table with my unchucking mechanism ap plied thereto. Fig. 2 is avertical section 011 line 22, Fig. 1. Fig. 3 is a vertical section online 33 of Fig. 1 with the table shown in broken lines. \Fig. at is apartialplan view, showing the application of my invention to a boringmill in which the slides move inwardly to open.

1 is the mill-housing.

2 is a bushing bolted to 1 to form a center about which the table turns.

3 is the driving-wheel, which rests on the housing 1 and turns about thebushing 52 as a center.

with the wheel 3.

5 is the chucking-table, which centers on the driving-wheel 3 and restsu on the ring 6, which in turn rests upon the housing 1.

7, 7, 7, are the radial arms of the chuck operated by the cam-plate -8.The camplate is bolted to and driven by the drivingwheel 3.

9, 9, 9, are the adjustable jaws of the ghuck, which are secured to theradial arms It will be seen from the drawings that opened, to permit thetable to'rotate with at is the driving-pinion, which engages.

the plate of the driving-wheel 3 is cut away at intervals to permit lugson the table 5 to pass through and attach to the ring 6. The slots onthewheel 3 serve also as stops to limit the movement of thedriving-wheel relative to the chucking-table 5. In this way thedriving-wheel 3 and chuckin -table 5 are both supported from the housingindependently of each other, so that the chucking-table 5 may be held bythe friction of its own weight and thatof the work which it centerswhile'the driving-wheel 3 rotates and tightens the jaws, When the. jaws9, 9, 9, are drawn by the cam-plate 8 and arms 7,7, 7, against the wheelto be centered and driven, the resistance to further tightening becomesso great that the chucking-table is started by the cam-plate actingagainst the arms 7, 7, 7. The spiral of the cam-faces should be suchthat no recoil can take place, and so that the greater the. resistancethe tighter the chuck will hold.

The construction so far described is iden-.

while the cam-plate continues its reverse motion to the extent requiredto. open the chuck, and then to release the table to permil; it torotate with the chuck, the release of the table after the opening of thechuck being essential for the reason that as soon as the cams have movedto the limit of their motion relatively to the table, the latter will bepositively driven and must be then free to move if an accident is to beavoided.

To arrestthe movement of the table after the reversal of the drivingmechanism, a latch leVer.1O is pivoted on the h using, and the free endof the lever is providediwith an inward-extending projection having aninclined rear face. This lever is in such position that in the-reversemotion of the table its free end will drop into a pocket in thecircumference of the table and lock it from movement. In the embodimentof my invention herein set forth, the pockets for the reception of thelatch are formed by the guides for the sliding chuck-arms 7, the armsbeing set into the guides so as to be flush with the surface of thetable and being of such length that when the chucks are closed on thework the ends of the slides are inside of the circumference of thetable. Hence the latch, if appropriately spring-pressed or weighted,will move into the outer end per tion of the first chuck-arm guide thatmoves opposite thereto in the reversal of the table and will bring upagainst the side wall of the guide and stop or lock the table fromfurther movement. Immediately after the table has been locked frorumovement as described, the continuing reverse motion of the drivingmechanism will cause the arms 7 to move outwardly to release the work.During this movement, the end of the slide opposite the latch levercontacts with the same and pushes it clear of the edge of the table,permitting the table to then rotate without resistance. If the latch 10were under constant tension it would be operative, for in the normalmovement of the table during boring or turning, it would drop in and(owing to the inclined rear face of its projecting end) slide out of theseveral pockets in the table without oti'ering any resistance to themovement thereof. This constant frictional migagement of the latch.;with the periphery of the table is, however undesirable; and thefollowing means art provided to move it into operative position by.hand: The lever 10 IS in the form of a bent'lever PlfOtLtl between ltSends.

11 is a rod one end of which is contiguousto the arm of the lever thatdoes not engage the table. Fixed on the rod is a collar 12, be hindwhich is a stiff coiled spring 13 surrounding the rod. llis a leverhaving forks en'ibracing the rod and carrying a collar 15 I loose on therod back of the spring 13. By

operating the lever 11 to compress the spring 13, the rod 11 will moveand press againstthe lever 10, causing the latter to press against theperiphery of the table and spring into thefirst pocket that comes,opposite thereto in the reverse movement of the table.

'lhe'latch is free to be moved out of locking engagement by the outwardmovement of the radial chuck-arms even if the lever 1 1 be locked inposition, this being permitted by the compression of the 5 ring 13. Ofcourse, if the lever 14; is simply pressed forward by hand, and notlatched, the spring would be unnecessary.

It is desirable that the lock or stop for the table be brought intooperative position in the movement to reverse the controller for thedriving mechanism, thereby dispensing with the necessity ofa separatemanipulation to bring the stop into operative position. This is effectedby the following mechanism: The lever 14 is secured to a shaft 16turning in a bearing carried by a bracket 17 bolted to the housing 1. Tothis shaft 16 is secured-an arm 18, whose free end is in line of travelof a pin 19. on one of the segments of a double segmental gear wheel 20.

()ne of these segments is engaged by a.

pinion '21 on the controller shaft 22. -The other segment engages apinion 23 on: the

shaft of a controller, within the casing 30,

which controls the-driving mechanism for the mill, which means, beingold, need not be specificallv set forth. On the shaft 22 is an arm 2%.in the full-line position shown, the arm 2 is in the position itoccupies when the machine is reversing. Then the arm 24 is moved to thedotted line position, the niachine is stopped. When the arm Q-l is movedbeyond the dotted line position, the driving mechanism is started, firstto clutch the work and then torotate it forwardly. In the motion of thecontrol arm 24 to start the machine forwardly, the pin 19 on wheel 20recedes from the arm 18, and lever 14 is not operated. After the arm 24is returned to its central dotted line position and then moved beyond ittoits full line position, to

. reverse, the ,pin 19 engages and moves the arm 18, turning the shaft16 and lever 14 and moving the latch lever 10 into operative position asbefore described.

In some instances the chuck moves outwardly to close and inwardly toopen. This is when the work is held by its inside edge instead of by itsoutside circumference. In-

suchcases, the latch lever 25 (see Fig. 4) iscaused to impinge againstthe projecting end of the chuck-arm in the reverse motion of the table,and the arm is withdrawn in the act of opening the chuck until the outerend of the arm moves substantially. flush with the circumference of thetable, after which the table is free to rotate.

Having now fully described my invention, what- I claim and desire toprotect by Letters Patent is 1. 111a boring or turning machine, thecombination with the rotatable chucking table, of chuck-jaw arms carriedthereby, driving mechanism, having a'limited movement independent of thetable, adapted to move said arms .into clamping engagement with the workand then rotate the table, and a stop adapted, in the reverse movementof the table, to hold the table from movement.

2. In a boringor turning machine, the combination with the rotatablechucking table, of means, having a limited movement relative to thetable and including chuck- .jaws carried by the table, adapted to beoperated to clamp the jaws upon the work and then rotate the table, anda stop adapted, in the reverse movement of the table, to hold the tablefrom movement, said stop being adapted to beengaged by one of theelements the table, and a stop, adapted, during the reverse movement ofsaid driving mechanism, to arrest the movementof the table and to bereleased by the retraction of 'said arms in the continuing reversemovement of the driving mechanism.

41-111 a boring or turning machine, the combination with the rotatablechucking table, of chuck-jaw operating meanscomprising ,radial groovesin the table and radial arms slidable therein, driving mechanism,having'a limited movement independ ent of the table, adaptedto movesaid, arms into clamping engagement with the work and then rotate thetable, and a stop, ar-

ranged contiguous to the periphery of the table, adapted, during thereverse movement of said driving mechanism, to engage one of thespecified elements of the chuck-jaw operating means and thereby arrestthe movement of the table and adapted to be released by the retractionof the radial arms in the continuing movement of thedriving mechamsm.

5. In a boring or turning machine, the

combination with the rotatable chucking.

table, of chuck-jaw arms carried thereby, driving mechanism, having alimited movement independent of the table, adapted to move .said armsinto clamping engagement with the work and then rotate the table, astop, adapted, in the reverse movement of the table, to hold the tablefrom movement, and means'to bring the stop into engagement and to permitit to be disengaged after the chuck-jaw arms have moved to open theclutch.

6. In a boring or turning machine, the

combination with the rotatable chucking table having radialopen-endedgrooves an chuck-jaw arms slidable therein, of driving ,mechanism,having a limited movement independent of the table, adapted to move saidarms inwardly into clamping engagement with the work and then rotate thetable, and a latch, arranged contiguous to the table, adapted, duringthe reverse movement of said driving mechanism, to be projected into theouter end of one of said grooves. and abut against the side wallthereof, thereby locking the table and adapted, by the outward movementof said arms, to be engaged and released thereby in the continuingreverse movement of the driving mechanism and the resultant retractionof the arms from the work.

7. In a boring or turning machine, the combination with the rotatablechucking table, of means, having a limited movement relative to thetable and including chuckjaws carriedby the table, adapted to beoperated to clamp the jaws upon the work and then rotate the table, astop arranged and the stop and adapted when compressed by said lever tomove the stop, during the reverse movement of the driving mechanism,into position to arrest the movement of the table, said spring yieldingto permit the stop to be moved out of locking engagement.

8. In a boring or turning machine, the combination with the rotatablechucking table, of sliding chuck-jaw' arms carried thereby, drivingmechanism, having a limited movement independent of the table, adaptedto move said arms into operative engagement with the work and thenrotate the table, a stop adapted to arrest the reverse movement of thetable, means to move the stop into position to perform its stoppingfunction during the reverse movement of the table, a control lever forthe driving mechanism, and means, actuated by the control lever when thesame is moved to reverse the driving mechanism, adapted to render thestopactuating means operative.

9. In a boring or turning machine, the combination with the rotatablechucking table, of means, having a limited movement relative to thetable and including chuckjaws carried by thetable, adapted to beoperated to clamp the jaws upon the Work I and then rotate the table, astop arranged into position to arrest the movement of the" table, saidspring yielding to permit the stop to be moved out of lockingengagement, a control lever for the driving mechanism, and means,actuated by the control lever when the same is moved to reverse thedriving mechanism, adapted to move the stop-operating lever tocompressthe spring.

In testimony of which invention, I have hereunto set my hand, atPhiladelphia, on this 15th day of July, 1910.

LARS H. VOLD.

Witnesses HELEN F AHNESTOOK, WARREN R. CHURCH.

